dt-bindings: timer: renesas: ostm: Document Renesas RZ/V2H(P) SoC

Document the General Timer Module (a.k.a OSTM) block on Renesas RZ/V2H(P)
("R9A09G057") SoC, which is identical to the one found on the RZ/A1H and
RZ/G2L SoCs. Add the "renesas,r9a09g057-ostm" compatible string for the
RZ/V2H(P) SoC.

Signed-off-by: Lad Prabhakar <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/timer/renesas,ostm.yaml

···
           - renesas,r9a07g043-ostm # RZ/G2UL and RZ/Five
           - renesas,r9a07g044-ostm # RZ/G2{L,LC}
           - renesas,r9a07g054-ostm # RZ/V2L
+          - renesas,r9a09g057-ostm # RZ/V2H(P)
       - const: renesas,ostm        # Generic
 
   reg:
···
           - renesas,r9a07g043-ostm
           - renesas,r9a07g044-ostm
           - renesas,r9a07g054-ostm
+          - renesas,r9a09g057-ostm
 then:
   required:
     - resets